import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class _3_SimpleExpression {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scan = new Scanner(System.in);
		String inputLine = scan.nextLine().trim();

		Pattern numberPatt = Pattern.compile("\\d{1,10}([.]*([0-9]{0,9}))*");
		Matcher matcher = numberPatt.matcher(inputLine);
		ArrayList<BigDecimal> numbers = new ArrayList<>();
		String numStr;
		while (matcher.find()) {
			numStr = matcher.group();
			numbers.add(new BigDecimal(numStr));
		}

		Pattern operatorPatt = Pattern.compile("\\+|\\-");
		matcher = operatorPatt.matcher(inputLine);
		ArrayList<String> operators = new ArrayList<>();
		while (matcher.find()) {
			operators.add(matcher.group());
		}

		BigDecimal sumOfNumbers = numbers.get(0);
		for (int i = 1; i < numbers.size(); i++) {
			if (operators.get(i - 1).equals("+")) {
				sumOfNumbers = sumOfNumbers.add(numbers.get(i));
			} else if (operators.get(i - 1).equals("-")) {
				sumOfNumbers = sumOfNumbers.subtract(numbers.get(i));
			} else {
				throw new IllegalArgumentException("Invalid operator: "
						+ operators.get(i - 1));
			}
		}

		System.out.println(sumOfNumbers.toPlainString());
	}
}